x2y2(x+y)-8xy(x+y)+16(x+y)

问题描述:

x2y2(x+y)-8xy(x+y)+16(x+y)

x2y2(x+y)-8xy(x+y)+16(x+y)
=(x+y)(x2y2-8xy+16)
=(x+y)(xy-4)2